ECO-FLO, ½ HP. 4400 gallons per hour. Heavy Duty Cast Iron Construction. Built-in Overload Motor Protection. Vertical Switch. Operates in basins 11" in diameter x 24" depth Solids Handling Vortex, Thermoplastic Impeller - ½" Solids Handling *Pro Tip: To determine your basin diameter, measure across your sump basin using a tape measure. *Pro Tip: We recommend purchasing a battery back up sump system for use in emergency power outages.